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/******************************************************************************************
*
* CHECK_HLTHERM.C
*
* Program: Hot Little Therm temperature plugin for Nagios
* License: GPL
* Copyright (c) 1999-2002 Ethan Galstad (nagios@nagios.org)
*
* Last Modified: 02-28-2002
*
* Command line: check_hltherm <probe> <wtemp> <ctemp> [-l label] [-s scale] [-lower]
*
* Description:
*
* This plugin checks the temperature of a given temperature probe on a
* Hot Little Therm digital thermometer. The plugin uses the 'therm' utility
* that is included with the HLT software to check the probe temperature. Both
* the HLT digital thermometer and software are produced by Spiderplant. See
* their website at http://www.spiderplant.com/hlt for more information.
*
*****************************************************************************************/
#include "config.h"
#include "common.h"
#include "popen.h"
#define DEFAULT_TIMEOUT 10 /* default timeout in seconds */
#define HLTHERM_COMMAND "/usr/local/bin/therm" /* this should be moved out to the configure script */
static void timeout_alarm_handler(int); /* author must provide */
int process_arguments(int, char **);
int timeout_interval=DEFAULT_TIMEOUT;
double wtemp=0.0L;
double ctemp=0.0L;
int check_lower_temps=FALSE;
char probe[MAX_INPUT_BUFFER]="";
char label[MAX_INPUT_BUFFER]="Temperature";
char scale[MAX_INPUT_BUFFER]="Degrees";
FILE *fp;
int main(int argc, char **argv){
int result=STATE_OK;
char command[MAX_INPUT_BUFFER];
double temp=0.0L;
char input_buffer[MAX_INPUT_BUFFER];
int found=0;
/* process command line arguments */
result=process_arguments(argc,argv);
/* display usage if there was a problem */
if(result==ERROR){
printf("Incorrect arguments supplied\n");
printf("\n");
printf("Hot Little Therm temperature plugin for Nagios\n");
printf("Copyright (c) 1999-2002 Ethan Galstad (nagios@nagios.org)\n");
printf("Last Modified: 02-28-2002\n");
printf("License: GPL\n");
printf("\n");
printf("Usage: %s <probe> <wtemp> <ctemp> [-l label] [-s scale] [-lower]\n",argv[0]);
printf("\n");
printf("Options:\n");
printf(" <wtemp> = Temperature necessary to result in a WARNING state\n");
printf(" <ctemp> = Temperature necessary to result in a CRITICAL state\n");
printf(" [label] = A descriptive label for the probe. Example: \"Outside Temp\"\n");
printf(" [scale] = A descriptive label for the temperature scale. Example: \"Celsius\"\n");
printf(" [-lower] = Evaluate temperatures with lower values being more critical\n");
printf("\n");
printf("This plugin checks the temperature of a given temperature probe on a\n");
printf("Hot Little Therm digital thermometer. The plugin uses the 'therm' utility\n");
printf("included with the HLT software to check the probe temperature. Both the\n");
printf("HLT digital thermometer and software are produced by Spiderplant. See\n");
printf("their website at http://www.spiderplant.com/hlt for more information.\n");
printf("\n");
return STATE_UNKNOWN;
}
result=STATE_OK;
/* Set signal handling and alarm */
if(signal(SIGALRM,timeout_alarm_handler)==SIG_ERR){
printf("Cannot catch SIGALRM");
return STATE_UNKNOWN;
}
/* handle timeouts gracefully */
alarm(timeout_interval);
/* create the command line we're going to use */
snprintf(command,sizeof(command),"%s %s",HLTHERM_COMMAND,probe);
command[sizeof(command)-1]='\x0';
/* run the command to check the temperature on the probe */
fp=spopen(command);
if(fp==NULL){
printf("Could not open pipe: %s\n",command);
return STATE_UNKNOWN;
}
if(fgets(input_buffer,MAX_INPUT_BUFFER-1,fp)){
found=1;
temp=(double)atof(input_buffer);
}
/* close the pipe */
spclose(fp);
if(result==STATE_OK){
if(found==0){
printf("Therm problem - Could not read program output\n");
result=STATE_CRITICAL;
}
else{
if(check_lower_temps==TRUE){
if(temp<=ctemp)
result=STATE_CRITICAL;
else if(temp<=wtemp)
result=STATE_WARNING;
}
else{
if(temp>=ctemp)
result=STATE_CRITICAL;
else if(temp>=wtemp)
result=STATE_WARNING;
}
printf("Therm %s: %s = %2.1f %s\n",(result==STATE_OK)?"ok":"problem",label,temp,scale);
}
}
return result;
}
/* process command-line arguments */
int process_arguments(int argc, char **argv){
int x;
/* not enough options were supplied */
if(argc<4)
return ERROR;
/* first option is always the probe name */
strncpy(probe,argv[1],sizeof(probe)-1);
probe[sizeof(probe)-1]='\x0';
/* 2nd and 3rd options are temperature thresholds */
wtemp=(double)atof(argv[2]);
ctemp=(double)atof(argv[3]);
/* process all remaining arguments */
for(x=5;x<=argc;x++){
/* we got the lower temperature option */
if(!strcmp(argv[x-1],"-lower"))
check_lower_temps=TRUE;
/* we got the label */
else if(!strcmp(argv[x-1],"-l")){
if(x<argc){
strncpy(label,argv[x],sizeof(label));
label[sizeof(label)-1]='\x0';
x++;
}
else
return ERROR;
}
/* we got the scale */
else if(!strcmp(argv[x-1],"-s")){
if(x<argc){
strncpy(scale,argv[x],sizeof(scale));
scale[sizeof(scale)-1]='\x0';
x++;
}
else
return ERROR;
}
/* else we got something else... */
else
return ERROR;
}
return OK;
}
/* handle timeouts gracefully... */
static void timeout_alarm_handler(int signo){
if(signo==SIGALRM){
kill(childpid[fileno(fp)],SIGKILL);
printf("Therm problem - Check timed out after %d seconds\n",timeout_interval);
exit(STATE_CRITICAL);
}
}
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